I have a Inspiron 15 Model 3521. It worked fine until recently it will not power up. Pressing the power button will cause the laptop to have a beep every 2 seconds - does not stop. There is no crt display. I have removed the HD - no effect. This happens whether it is powered by the battery or AC. The laptop will shut down by pressing the power button for 4 seconds. The power light comes on. each beep seems like it is 1 second long and repeats every 2 seconds. Any clue or help would be appreciated.
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